Orange, mandarin, tangerine all varieties of orange. Seeds probably rich in allergens but less likely to be eaten (chewing probably also required for reaction)!

Various allergens identified, including profilin (so oral allergy syndrome) and LTP (more in Mediterranean, cross reacts with Pru p3, not surprisingly).

One letter briefly touches on citrus cross reactivity – some tolerate lemon and/or tangerine, some had oral symptoms with tangerine, none had tried grapefruit. So varying and not well explored…